Commit 1fb8bd53 authored by Chun-wei Fan's avatar Chun-wei Fan Don't use fallback dep for libpng unnecessarily

We could have well found the headers and .lib's needed for libpng, so
only use the fallback wrapper for libpng when we couldn't find the
headers and .lib's.
parent a6ee5e08
Pipeline #65997 passed with stage
in 5 minutes and 3 seconds